Not able to connect with Oracle 11 from VC++ in VS 2008 using Oracle ODBC driver in W

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Not able to connect with Oracle 11 from VC++ in VS 2008 using Oracle ODBC driver in W

I was using Windows XP 32 bit o/s and I had a 32 bit application that was connecting with Oracle 11g database using Oracle ODBC driver.

Recently my company upgraded my machine to Window7, 64 bit SP1 o/s. I tried the following cases to get my app establish a odbc connection with the database but I was without luck so thought of check with the experts like.

Case 2:
Convert 32 bit to 64 bit application  with 64 bit oracle driver
Got error:
Specified driver could not be loaded due to system error 126: The specified module could not be found. (Microsoft ODBC for Oracle, C:\WINDOWS\system32\msorcl32.dll).